diff --git a/core/net/ip/uip-debug.c b/core/net/ip/uip-debug.c
index aee023169..ab3ba0765 100644
--- a/core/net/ip/uip-debug.c
+++ b/core/net/ip/uip-debug.c
@@ -55,18 +55,20 @@ uip_debug_ipaddr_print(const uip_ipaddr_t *addr)
   }
 #if NETSTACK_CONF_WITH_IPV6
   if(ip64_addr_is_ipv4_mapped_addr(addr)) {
-    /* Printing IPv4-mapped addresses is done according to RFC 3513 [1]
-	 *
-	 *     An alternative form that is sometimes more
-	 *     convenient when dealing with a mixed environment
+    /*
+     * Printing IPv4-mapped addresses is done according to RFC 3513 [1]
+     *
+     *     "An alternative form that is sometimes more
+     *     convenient when dealing with a mixed environment
      *     of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d,
      *     where the 'x's are the hexadecimal values of the
      *     six high-order 16-bit pieces of the address, and
      *     the 'd's are the decimal values of the four
      *     low-order 8-bit pieces of the address (standard
-     *     IPv4 representation).
+     *     IPv4 representation)."
      *
-     * [1] https://tools.ietf.org/html/rfc3513#page-5 */
+     * [1] https://tools.ietf.org/html/rfc3513#page-5
+     */
     PRINTA("::FFFF:%u.%u.%u.%u", addr->u8[12], addr->u8[13], addr->u8[14], addr->u8[15]);
   } else {
     for(i = 0, f = 0; i < sizeof(uip_ipaddr_t); i += 2) {